Weatherby .280 Ackley Improved 139 gr Hammer Custom 20/ct

The Weatherby .280 Ackley Improved 139 grain Hammer Custom load pairs Weatherby’s flat-shooting pedigree with Hammer’s precision-turned projectiles. This offering is built to deliver consistent velocity and repeatable construction for long-range hunting and precision shooting applications. The load emphasizes controlled expansion and retained mass, using Hammer Custom bullets manufactured with individual weight and micrometer inspection. Reported muzzle velocity for this cartridge is 3050 fps under test conditions, producing high downrange energy for its class.

Key Specifications

• The cartridge is chambered in .280 Ackley Improved.
• The bullet weight is 139 gr.
• The bullet type is listed as Hammer Custom.
• The bullet diameter is .284 inches (7.2 mm).
• The muzzle velocity is listed at 3050 fps.
• The muzzle energy is listed at 2871 ft lbs.
• Each box contains 20 rounds.
• There are 10 boxes per case.
• The ballistic coefficient (G1) is given as .410.

Designed for shooters who prioritize flat trajectory and consistent terminal performance, this Weatherby load combines established cartridge design with precision-manufactured Hammer Custom projectiles. Its balance of velocity, retained energy, and bullet construction makes it suited to extended-range hunting and precision work where repeatable results matter.